VQ 13: What is the difference between vinyl and polyurethane that is used to make vacuum bags?
Polyurethane vacuum bags last significantly longer than vinyl bags. With everyday use, vinyl has a tendency to develop tears and pinholes (which can be repaired). Polyurethane bags can withstand much more use and abuse because it is chemically engineered to be elastic. This elasticity is what makes it more puncture resistant than vinyl. Additionally, polyurethane has a much greater “memory”. In other words, it goes back to its original shape after being stretched. Learn more about these differences on this page.